error: expected identifier, found reserved identifier `_` --> $DIR/issue-91461.rs:2:7 | LL | a(_:b:,) | ^ expected identifier, found reserved identifier error: expected one of `)`, `,`, `.`, `?`, or an operator, found `:` --> $DIR/issue-91461.rs:2:8 | LL | a(_:b:,) | ^ expected one of `)`, `,`, `.`, `?`, or an operator error: aborting due to 2 previous errors